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class="sidebar-heading"><span>Webpack</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Node.js</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>性能优化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>手写代码</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="面试官-你是怎么处理vue项目中的错误的"><a href="#面试官-你是怎么处理vue项目中的错误的" class="header-anchor">#</a> 面试官：你是怎么处理vue项目中的错误的？</h1> <p><img src="https://static.vue-js.com/3cafe4f0-4fd9-11eb-ab90-d9ae814b240d.png" alt=""></p> <h2 id="一、错误类型"><a href="#一、错误类型" class="header-anchor">#</a> 一、错误类型</h2> <p>任何一个框架，对于错误的处理都是一种必备的能力</p> <p>在<code>Vue</code> 中，则是定义了一套对应的错误处理规则给到使用者，且在源代码级别，对部分必要的过程做了一定的错误处理。</p> <p>主要的错误来源包括：</p> <ul><li>后端接口错误</li> <li>代码中本身逻辑错误</li></ul> <h2 id="二、如何处理"><a href="#二、如何处理" class="header-anchor">#</a> 二、如何处理</h2> <h3 id="后端接口错误"><a href="#后端接口错误" class="header-anchor">#</a> 后端接口错误</h3> <p>通过<code>axios</code>的<code>interceptor</code>实现网络请求的<code>response</code>先进行一层拦截</p> <div class="language-js extra-class"><pre class="language-js"><code>apiClient<span class="token punctuation">.</span>interceptors<span class="token punctuation">.</span>response<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>
  <span class="token parameter">response</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> response<span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  <span class="token parameter">error</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>error<span class="token punctuation">.</span>response<span class="token punctuation">.</span>status <span class="token operator">==</span> <span class="token number">401</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      router<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">&quot;Login&quot;</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
      message<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">&quot;出错了&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> Promise<span class="token punctuation">.</span><span class="token function">reject</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="代码逻辑问题"><a href="#代码逻辑问题" class="header-anchor">#</a> 代码逻辑问题</h3> <h4 id="全局设置错误处理"><a href="#全局设置错误处理" class="header-anchor">#</a> 全局设置错误处理</h4> <p>设置全局错误处理函数</p> <div class="language-js extra-class"><pre class="language-js"><code>Vue<span class="token punctuation">.</span>config<span class="token punctuation">.</span><span class="token function-variable function">errorHandler</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// handle error</span>
  <span class="token comment">// `info` 是 Vue 特定的错误信息，比如错误所在的生命周期钩子</span>
  <span class="token comment">// 只在 2.2.0+ 可用</span>
<span class="token punctuation">}</span>
</code></pre></div><p><code>errorHandler</code>指定组件的渲染和观察期间未捕获错误的处理函数。这个处理函数被调用时，可获取错误信息和 <code>Vue</code> 实例</p> <p>不过值得注意的是，在不同<code>Vue</code> 版本中，该全局 <code>API</code> 作用的范围会有所不同：</p> <blockquote><p>从 2.2.0 起，这个钩子也会捕获组件生命周期钩子里的错误。同样的，当这个钩子是 <code>undefined</code> 时，被捕获的错误会通过 <code>console.error</code> 输出而避免应用崩</p></blockquote> <blockquote><p>从 2.4.0 起，这个钩子也会捕获 Vue 自定义事件处理函数内部的错误了</p></blockquote> <blockquote><p>从 2.6.0 起，这个钩子也会捕获 <code>v-on</code> DOM 监听器内部抛出的错误。另外，如果任何被覆盖的钩子或处理函数返回一个 Promise 链 (例如 async 函数)，则来自其 Promise 链的错误也会被处理</p></blockquote> <h4 id="生命周期钩子"><a href="#生命周期钩子" class="header-anchor">#</a> 生命周期钩子</h4> <p><code>errorCaptured</code>是 2.5.0 新增的一个生命钩子函数，当捕获到一个来自子孙组件的错误时被调用</p> <p>基本类型</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">(</span><span class="token parameter">err<span class="token operator">:</span> Error<span class="token punctuation">,</span> vm<span class="token operator">:</span> Component<span class="token punctuation">,</span> info<span class="token operator">:</span> string</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token operator">?</span>boolean
</code></pre></div><p>此钩子会收到三个参数：错误对象、发生错误的组件实例以及一个包含错误来源信息的字符串。此钩子可以返回 <code>false</code> 以阻止该错误继续向上传播</p> <p>参考官网，错误传播规则如下：</p> <ul><li>默认情况下，如果全局的 <code>config.errorHandler</code> 被定义，所有的错误仍会发送它，因此这些错误仍然会向单一的分析服务的地方进行汇报</li> <li>如果一个组件的继承或父级从属链路中存在多个 <code>errorCaptured</code> 钩子，则它们将会被相同的错误逐个唤起。</li> <li>如果此 <code>errorCaptured</code> 钩子自身抛出了一个错误，则这个新错误和原本被捕获的错误都会发送给全局的 <code>config.errorHandler</code></li> <li>一个 <code>errorCaptured</code> 钩子能够返回 <code>false</code> 以阻止错误继续向上传播。本质上是说“这个错误已经被搞定了且应该被忽略”。它会阻止其它任何会被这个错误唤起的 <code>errorCaptured</code> 钩子和全局的 <code>config.errorHandler</code></li></ul> <p>下面来看个例子</p> <p>定义一个父组件<code>cat</code></p> <div class="language-js extra-class"><pre class="language-js"><code>Vue<span class="token punctuation">.</span><span class="token function">component</span><span class="token punctuation">(</span><span class="token string">'cat'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    template<span class="token operator">:</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">
        &lt;div&gt;
			&lt;h1&gt;Cat: &lt;/h1&gt;
        	&lt;slot&gt;&lt;/slot&gt;
        &lt;/div&gt;</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span>
    props<span class="token operator">:</span><span class="token punctuation">{</span>
        name<span class="token operator">:</span><span class="token punctuation">{</span>
            required<span class="token operator">:</span><span class="token boolean">true</span><span class="token punctuation">,</span>
            type<span class="token operator">:</span>String
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token function">errorCaptured</span><span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span>vm<span class="token punctuation">,</span>info</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">cat EC: </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>err<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">\ninfo: </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>info<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>定义一个子组件<code>kitten</code>，其中<code>dontexist()</code>并没有定义，存在错误</p> <div class="language-js extra-class"><pre class="language-js"><code>Vue<span class="token punctuation">.</span><span class="token function">component</span><span class="token punctuation">(</span><span class="token string">'kitten'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    template<span class="token operator">:</span><span class="token string">'&lt;div&gt;&lt;h1&gt;Kitten: {{ dontexist() }}&lt;/h1&gt;&lt;/div&gt;'</span><span class="token punctuation">,</span>
    props<span class="token operator">:</span><span class="token punctuation">{</span>
        name<span class="token operator">:</span><span class="token punctuation">{</span>
            required<span class="token operator">:</span><span class="token boolean">true</span><span class="token punctuation">,</span>
            type<span class="token operator">:</span>String
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>页面中使用组件</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>app<span class="token punctuation">&quot;</span></span> <span class="token attr-name">v-cloak</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>cat</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>my cat<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>kitten</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>kitten</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>cat</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>在父组件的<code>errorCaptured</code>则能够捕获到信息</p> <div class="language-js extra-class"><pre class="language-js"><code>cat <span class="token constant">EC</span><span class="token operator">:</span> TypeError<span class="token operator">:</span> dontexist is not a <span class="token keyword">function</span>
info<span class="token operator">:</span> render
</code></pre></div><h3 id="三、源码分析"><a href="#三、源码分析" class="header-anchor">#</a> 三、源码分析</h3> <p>异常处理源码</p> <p>源码位置：/src/core/util/error.js</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// Vue 全局配置,也就是上面的Vue.config</span>
<span class="token keyword">import</span> config <span class="token keyword">from</span> <span class="token string">'../config'</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> warn <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./debug'</span>
<span class="token comment">// 判断环境</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> inBrowser<span class="token punctuation">,</span> inWeex <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./env'</span>
<span class="token comment">// 判断是否是Promise，通过val.then === 'function' &amp;&amp; val.catch === 'function', val ！=== null &amp;&amp; val !== undefined</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> isPromise <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'shared/util'</span>
<span class="token comment">// 当错误函数处理错误时，停用deps跟踪以避免可能出现的infinite rendering</span>
<span class="token comment">// 解决以下出现的问题https://github.com/vuejs/vuex/issues/1505的问题</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> pushTarget<span class="token punctuation">,</span> popTarget <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../observer/dep'</span>

<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">handleError</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token operator">:</span> Error<span class="token punctuation">,</span> vm<span class="token operator">:</span> any<span class="token punctuation">,</span> info<span class="token operator">:</span> string</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// Deactivate deps tracking while processing error handler to avoid possible infinite rendering.</span>
    <span class="token function">pushTarget</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token keyword">try</span> <span class="token punctuation">{</span>
        <span class="token comment">// vm指当前报错的组件实例</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>vm<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">let</span> cur <span class="token operator">=</span> vm
            <span class="token comment">// 首先获取到报错的组件，之后递归查找当前组件的父组件，依次调用errorCaptured 方法。</span>
            <span class="token comment">// 在遍历调用完所有 errorCaptured 方法、或 errorCaptured 方法有报错时，调用 globalHandleError 方法</span>
            <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>cur <span class="token operator">=</span> cur<span class="token punctuation">.</span>$parent<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">const</span> hooks <span class="token operator">=</span> cur<span class="token punctuation">.</span>$options<span class="token punctuation">.</span>errorCaptured
                <span class="token comment">// 判断是否存在errorCaptured钩子函数</span>
                <span class="token keyword">if</span> <span class="token punctuation">(</span>hooks<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                    <span class="token comment">// 选项合并的策略，钩子函数会被保存在一个数组中</span>
                    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> hooks<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                        <span class="token comment">// 如果errorCaptured 钩子执行自身抛出了错误，</span>
                        <span class="token comment">// 则用try{}catch{}捕获错误，将这个新错误和原本被捕获的错误都会发送给全局的config.errorHandler</span>
                        <span class="token comment">// 调用globalHandleError方法</span>
                        <span class="token keyword">try</span> <span class="token punctuation">{</span>
                            <span class="token comment">// 当前errorCaptured执行，根据返回是否是false值</span>
                            <span class="token comment">// 是false，capture = true，阻止其它任何会被这个错误唤起的 errorCaptured 钩子和全局的 config.errorHandler</span>
                            <span class="token comment">// 是true capture = fale，组件的继承或父级从属链路中存在的多个 errorCaptured 钩子，会被相同的错误逐个唤起</span>
                            <span class="token comment">// 调用对应的钩子函数，处理错误</span>
                            <span class="token keyword">const</span> capture <span class="token operator">=</span> hooks<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>cur<span class="token punctuation">,</span> err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info<span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token boolean">false</span>
                            <span class="token keyword">if</span> <span class="token punctuation">(</span>capture<span class="token punctuation">)</span> <span class="token keyword">return</span>
                        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                            <span class="token function">globalHandleError</span><span class="token punctuation">(</span>e<span class="token punctuation">,</span> cur<span class="token punctuation">,</span> <span class="token string">'errorCaptured hook'</span><span class="token punctuation">)</span>
                        <span class="token punctuation">}</span>
                    <span class="token punctuation">}</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        <span class="token comment">// 除非禁止错误向上传播，否则都会调用全局的错误处理函数</span>
        <span class="token function">globalHandleError</span><span class="token punctuation">(</span>err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
        <span class="token function">popTarget</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token comment">// 异步错误处理函数</span>
<span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">invokeWithErrorHandling</span> <span class="token punctuation">(</span>
<span class="token parameter">handler<span class="token operator">:</span> Function<span class="token punctuation">,</span>
 context<span class="token operator">:</span> any<span class="token punctuation">,</span>
 args<span class="token operator">:</span> <span class="token keyword">null</span> <span class="token operator">|</span> any<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
    vm<span class="token operator">:</span> any<span class="token punctuation">,</span>
        info<span class="token operator">:</span> string</span>
        <span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">let</span> res
            <span class="token keyword">try</span> <span class="token punctuation">{</span>
                <span class="token comment">// 根据参数选择不同的handle执行方式</span>
                res <span class="token operator">=</span> args <span class="token operator">?</span> <span class="token function">handler</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token function">handler</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span>
                <span class="token comment">// handle返回结果存在</span>
                <span class="token comment">// res._isVue an flag to avoid this being observed，如果传入值的_isVue为ture时(即传入的值是Vue实例本身)不会新建observer实例</span>
                <span class="token comment">// isPromise(res) 判断val.then === 'function' &amp;&amp; val.catch === 'function', val ！=== null &amp;&amp; val !== undefined</span>
                <span class="token comment">// !res._handled  _handle是Promise 实例的内部变量之一，默认是false，代表onFulfilled,onRejected是否被处理</span>
                <span class="token keyword">if</span> <span class="token punctuation">(</span>res <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span>res<span class="token punctuation">.</span>_isVue <span class="token operator">&amp;&amp;</span> <span class="token function">isPromise</span><span class="token punctuation">(</span>res<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span>res<span class="token punctuation">.</span>_handled<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                    res<span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token parameter">e</span> <span class="token operator">=&gt;</span> <span class="token function">handleError</span><span class="token punctuation">(</span>e<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info <span class="token operator">+</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string"> (Promise/async)</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span>
                    <span class="token comment">// avoid catch triggering multiple times when nested calls</span>
                    <span class="token comment">// 避免嵌套调用时catch多次的触发</span>
                    res<span class="token punctuation">.</span>_handled <span class="token operator">=</span> <span class="token boolean">true</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token comment">// 处理执行错误</span>
                <span class="token function">handleError</span><span class="token punctuation">(</span>e<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info<span class="token punctuation">)</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> res
        <span class="token punctuation">}</span>

<span class="token comment">//全局错误处理</span>
<span class="token keyword">function</span> <span class="token function">globalHandleError</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 获取全局配置，判断是否设置处理函数，默认undefined</span>
    <span class="token comment">// 已配置</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>config<span class="token punctuation">.</span>errorHandler<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">// try{}catch{} 住全局错误处理函数</span>
        <span class="token keyword">try</span> <span class="token punctuation">{</span>
            <span class="token comment">// 执行设置的全局错误处理函数，handle error 想干啥就干啥💗</span>
            <span class="token keyword">return</span> config<span class="token punctuation">.</span><span class="token function">errorHandler</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info<span class="token punctuation">)</span>
        <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">// 如果开发者在errorHandler函数中手动抛出同样错误信息throw err</span>
            <span class="token comment">// 判断err信息是否相等，避免log两次</span>
            <span class="token comment">// 如果抛出新的错误信息throw err Error('你好毒')，将会一起log输出</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>e <span class="token operator">!==</span> err<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token function">logError</span><span class="token punctuation">(</span>e<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token string">'config.errorHandler'</span><span class="token punctuation">)</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token comment">// 未配置常规log输出</span>
    <span class="token function">logError</span><span class="token punctuation">(</span>err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info<span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token comment">// 错误输出函数</span>
<span class="token keyword">function</span> <span class="token function">logError</span> <span class="token punctuation">(</span><span class="token parameter">err<span class="token punctuation">,</span> vm<span class="token punctuation">,</span> info</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>process<span class="token punctuation">.</span>env<span class="token punctuation">.</span><span class="token constant">NODE_ENV</span> <span class="token operator">!==</span> <span class="token string">'production'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">warn</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Error in </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>info<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">: &quot;</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>err<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">&quot;</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span> vm<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    <span class="token comment">/* istanbul ignore else */</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>inBrowser <span class="token operator">||</span> inWeex<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> console <span class="token operator">!==</span> <span class="token string">'undefined'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token keyword">throw</span> err
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="小结"><a href="#小结" class="header-anchor">#</a> 小结</h3> <ul><li><code>handleError</code>在需要捕获异常的地方调用，首先获取到报错的组件，之后递归查找当前组件的父组件，依次调用<code>errorCaptured</code> 方法，在遍历调用完所有 <code>errorCaptured</code> 方法或 <code>errorCaptured</code> 方法有报错时，调用 <code>globalHandleError</code> 方法</li> <li><code>globalHandleError</code>调用全局的 <code>errorHandler</code> 方法，再通过<code>logError</code>判断环境输出错误信息</li> <li><code>invokeWithErrorHandling</code>更好的处理异步错误信息</li> <li><code>logError</code>判断环境，选择不同的抛错方式。非生产环境下，调用<code>warn</code>方法处理错误</li></ul> <h2 id="参考文献"><a href="#参考文献" class="header-anchor">#</a> 参考文献</h2> <ul><li><p>https://juejin.cn/post/6844904096936230925</p></li> <li><p>https://segmentfault.com/a/1190000018606181</p></li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">更新时间:</span> <span class="time">12/14/2021, 10:12:35 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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